Source, transport, and fate of nitrate in shallow groundwater in the eastern Niger Delta

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 20, 2024

Abstract The eastern Niger Delta region in Nigeria is a hotspot for reactive nitrogen pollution due to extensive animal husbandry, pit latrine usage, and agricultural practices. Despite the high level of human activity, sources processes affecting groundwater remain understudied. Groundwater nitrate (NO 3 − ) concentrations are highly variable, with some areas recording values well above safe drinking water threshold 50 mg/L. This particularly true near municipal sewage systems. Elevated nitrite 2 ammonium (NH 4 + were also detected study area. Sewage analysis revealed NO ranging from 1 145 mg/L, 0.2 notably NH concentrations. A comparison major ions indicated that 71%, 90%, 87%, 92% samples surpassed reference site levels calcium (Ca 2+ ), sodium (Na potassium (K chloride (Cl respectively, pointing as likely source contamination. /Cl ratios at several sites suggested most originates waste. Stable isotope showed general enrichment 15 N and, cases, depletion 18 O, indicating sewage-derived nitrification. Although denitrification, process reduces , present, dissolved oxygen (DO) suggest denitrification insufficient fully mitigate pollution. Consequently, there risk leaching shallow aquifers into Delta’s surface waters ultimately coastal ocean.

Language: Английский

Elevated mercury (Hg) in groundwater caused by oil and gas production

Applied Geochemistry, Journal Year: 2024, Volume and Issue: unknown, P. 106259 - 106259

Published: Dec. 1, 2024

Language: Английский